code: def test_gaussian():
      p1 = p + geom_density(kernel="gaussian", alpha=0.3)
      assert p1 == "gaussian"
  
file_path: plotnine/tests/test_geom_density.py
imports: import numpy
  import pandas
  import pytest
  from plotnine import aes, geom_density, ggplot, lims
  from plotnine.exceptions import PlotnineWarning
label_desc: Use image node_id 1 for calling a global function with example usage: test_gaussian() without return types